Manually-operated broaching machine



F. J. LAPOINTE. MANUALLY OPERATED BROACHING MACHINE- APPLICATION FILED JUNE 8, 1921.

Patented Nov. 7, 19221. I192.

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Patented Nov. 7, 1.922-

PATENT FRANCIS J. LAPOINTE, OF ANN ARBOR, MICHIGAN.

MANUALLY-OPERATED BROACHING MACHINE.

Application filed June 8,

To all whom it may concern:

Be it known that I, FnAnois J. LArom'rn, a citizen of the United States of America, and a resident of Ann Arbor in the county of Washtenaw and State of Michigan, have invented certain new and useful Improvements in Manually-Operated Broaching Machines, of which the following is a specification.

This invention relates to broaching machines and has for its object the provision of an inexpensive device of this character particularly adapted for use in service stations and garages for the purpose of broaching out the worn holes in pistons to receive oversize piston pins and also to form new bearings in the larger ends of connecting rods.

The invention consists in providing on a frame, a base projection having a centering opening to receive the hub of a work holder and another projection having a reciprocating member or ram adapted to force a broaching tool through the work held by the holder.

The invention further consists in certain novel features of construction and arrangement of parts which will be understood readily by reference to the description of the drawings and to the claims to be hereinafter given.

For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized and the invention is not limited to the precise arrangement and organization' of these instrumentalities as herein shown and described except as required by the scope of the appended claims.

Of the drawings:

Figure 1 represents a side elevation of a machine embodying the features of the present invention. 7

Figure 2 represents avertical section of the same. v

Figure 3 represents a horizontal section of the same on line 3, 3, on Fig. 1, and

Figure 1 represents a vertical section of the same on line 1, 4, on Fig. 1.

1921. Serial No. 476,082.

Similar characters indicate like parts throughout the several figures of the drawings.

In thedrawings, 10 is a frame having a base 11 by which the frame may be secured to any suitable bench by means of bolts or other securing members 12.

The frame 11 has two lateral projections 13 and14, these pro ections 13 and 1 1 being provided with alined holes or openings 10 and 16.

The hole 15 in the upper projection 13 has disposed therein, a reciprocating member or ram 16 provided with a plurality of rack teeth 17 meshing with a pinion 18 formed upon a revoluble shaft 19.

This shaft 19 is provided with an annular groove 20 into which extends the reduced end of a screw 21 mounted in the frame 10 and adapted to prevent end movement of said shaft.

The outer end of the shaft 19 has keyed thereto, a hand wheel 22 having a plurality of radial sockets 23 formed therein.

An operating lever 21 is provided which may be inserted into either one of the sockets 23 and secured therein by means of clamping screw 25.

To the lower end of the reciprocating member or ram 16 is threaded a screw 26 having a cone-shaped centering device 27 formed on its lower end.

This centering device 27 is adapted to fit into a cone-shaped socket 28 formed in the upper end of a broaching tool 29.

A. plurality of broaching tools of different diameters are provided. either one of which may he used in connection with the machine according to the class of work to be performed.

The machine is provided with a removable work holder 30. 4

This-work holder 30 is made in two parts. 31 and secured together by means of the clamping bolts 33.

The work holder is provided with a horizontal cylindrical opening 3 1 therethrough adapted to receive an engine piston 35 to be operated upon.

The lower part 31 of the work holder 30 is provided with an annular hub 36 adapted to fit accurately into the opening 16 in the lower projection or work support 14.

vided with holes 37 and 88 corresponding to the oversize piston pins which are manufactured. for diiferent motor cars and a corresponding numher of broaching tools are provided which fit the various sizes of holes and 38.

iVhen the bearing in piston becomes worn so that the piston pin does not accurately lit the same, the piston is removed from the engine and is clamped in the work holder 36 between the parts 31 and 32 as indicated in Fig. 1 of the drawings, the pin holes in said piston being positioned in alinement with the holes 37 and 38.

lVith the ram or reciprocating member 16 raised. the proper broachin'g; tool 29 is then inserted into the hole 88 and the ram or reciprocating member 16 is then lowered until the centering device 27 I enters the socket 28 in the upper end of the broaching tool.

Vi hen this has been accomplished, the operator manipulates the hand wheel until the lower end of the broaching tool is forced into contact with the piston or other work being operated. upon.

Additional pressure is then applied to the outer end of the operating lever 2 L causing the breaching-tool to be forced through the pin hole of the piston enlarging it accurately to it the oversize pin to be subsequently inserted therein.

When it is desired to use the machine to take up the wear in the large end of a connesting rod, a work holder 40 is provided the cylindrical hub of which accurately fits the opening 16 in the lower projection liv while the upper face of said work holder is provided with a o lindrical de )ression d1. J

adapted to receive the projecting end of the babbitt bearing 42 of the connecting rod 43.

Before positioning the connecting rod up on the work holder 40, some of the shims be tween the connecting rod proper and its cap are removed and the cap is then again secured to the connecting rod.

By the removal of the'shims, the hole through the babbitt bearing'is made smaller.

The proper hroaching tool is then positioned in and centered with the babbitt bean ing 12 and is forced through the same by means of the ram or reciprocating member 16 thereby forming a new bearing surface therein.

This device is particularly adapted for use in service stations and garages but it is obvious that it might be used equally as well in manufacturing plants as the time and labor consumed in performing the work is reduced to a minimum over the methods now in general use.

[all the manufacturers of motor cars provide oversize piston pins which are intended to be inserted when the original pin becomes loose in its hearing.

The service ations and most of the garages have no means, however, of producing a hole in the piston to receive these oversize pins except by scraping or reaming. r

These methods are very unsatisfactory for in scraping, the shape of the hole is adapted to be lost as good mechanics are ver Y seldom employed in service stations and garages and consequently know very little about scraping.

For the same reason in reaming the holes, the hole is usually chattered badly while in using a spiral fluted reamer the hole in one boss is generally made larger than the other.

Furthermore, in this method, the holes do not aline when the reamer has passed through one boss and approaches the other and as a consequence the mechanic is apt to force it into alinement with the other hole thereby forming an oval shaped hole which is very objectionable.

in the present case the brooches are made in the usual manner vith their lower end of somewhat less diameter than the upper end but the difference in diameters is too small to be" indicated in the drawing.

.Vhen the work and its holder is positioned upon the work support 14', as previously described, the lower end of the broaching tool 29 is inserted into the hole in the work before the ram or reciprocating inoniher 16 is moved downwardly against the upper end of the breach to force it through the work. I

As the upper f cc of the table or work support 14- is at right angles to the axis of the holes 15 and 16 and these holes are in perfect aiinement, it will be apparent that in the movement of the breachingtool it will be gruided both below and above and consequently a perfectly straight hole through the work is assured.

Each manufacturer of motor cars provides a plurality of oversize pins which are adapt- .ed to be successively used as the pin bearing becomes worn a new and larger pin replacing the pin previously used.

The present invention consists in part in providing a series of broaching tools corresponding to each of the oversize pins furnished by the various manufacturers, so that in a garage or service station the worn pin holecof whatever size it may be, may be quickly broached to receive the nextlarger size of pin.

@bviously this would be of great advantage as each service station and garage would 1. A frame having two lateral projections provided with alined cylindrical holes with unbroken walls; a work holder having an annular hub fitting one hole; a broaching tool; and means disconnected from the broaching tool and reciprocable in the other hole for forcing the broaching tool through the work on said holder.

2. A frame having two lateral projections provided with alined holes; a work holder having an annular hub fitting one hole; a

broaching tool; a rack in the other hole; a driving pinion meshing therewith; means for rotating said pinion; and means on the rack for centering the broaching tool there with. j

8. A frame having two lateral projections provided with alined holes; a work holder having an annular hub fitting one hole; a reciprocating member in the other hole; a centering device in the lower end thereof; means for reciprocating said member; and a broaching tool having in its upper end a socket to receive said centering device.

4. A. frame having two lateral projections provided with'alined holes; a work holder having an annular hub fitting one hole; a reciprocating member in the other hole; a centering device in the lower end thereot having a cone-shaped lower end; means for reciprocating said member; and a broaching tool having in its upper enda cone shaped socket to receive said centering device. i

5. In a broaching machine; a work holder in two parts of which the lower part is pro vided with an annular hub adapted to fit a hole in a projection on said machine and said parts having cylindrical holes therein alined with the said hole and adapted to receive a broaching tool in said projection; and means for securing together theholder parts.

6. A frame having a work support and a lateral projection above said support provided with a vertical guide-way; a work holder provided with means for positioning the work thereon beneath said projection; a reciprocating member in said guide-way; means for imparting reciprocatory movement thereto; a broaching tool adapted to be actuated by said member; and means on said work holder for centering it on said support in the path of movement of said tool.

7. Aztrame having a work support provided with a cylindrical opening; a work holder having a hub fitting said opening; a breaching tool; and 'manually actuated means disconnected from the broaching tool mounted on said frame for imparting movement to said tooltoward said work support.

8. A frame having a work support; a work holder; a broaching tool having a cone-shaped socket in its upper end; means reciprocable on said frame having a centering device adapted to coact with said socket; and

means on said work holder for centering it with said tool.

9. frame having work support; a work holder having alined holes therein; a broaching tool having a cone-shaped socket in its upper end; means reciprocable on said frame having a centering device adapted to coact with said socket; and means on said work holder for centering the alined holes of said holder with said tool.

Signed by me at city of Ann Arbor,

county of Washtenaw Michigan, this 1st day of June, 1921.

FRANCIS J. LAPOINTE.

Witnesses Rosoon G. BoNIsTnnL, DAVID A. De Lone. 

